BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, MAY 24, 2010 ALL TIMES ARE IN EASTERN STANDARD TIME THE FEEL OF SUMMER DURING LATE MAY TEMPS. JUMP TO NEAR 80 DEGREES ALONG WITH SUNSHINE, HAZE AND MODERATE HUMIDITY The temperature started out with a low in the upper 50's or more like mid-June. The high had reached near 80 degrees by early afternoon so today's average will be close to 10 degrees warmer than normal. Visibility has been 20 to 25 miles at best along with increasing haze. Our dew point temperature near 60 deg. has made it feel like a summer day. Today's observations: 7 A.M. Weather: Clear, small cumulus forming over city north, few altocumulus distant SE-SSW, stratus layers below summit southeast to southwest to northwest to northeast dissipating past hour, estimated top 4 hundred feet, partial undercast condition Temperature: 63F, Dew point: 60F, Wind: WSW at 4 kts Sea-level pressure: 30.32 inches Hg, rising Visibility: 12 miles, thin fog and hazy 6-hour precipitation: 0.00 6-hour minimum temp: 58F BHO SA 1155 CLR 12 269/63/60/2404/032/ SML CU FRMG OVR CTY N FEW AC DSNT SE-SSW STRA LYRS BLO SMT/PARTIAL UNDRCST SE-SW-NE DSSPTNG PST HR ESTMTD TOPS 4 HND THN FG HAZY/ 8/140 51015 10063 20058 10 A.M. Weather: Scattered stratocumulus and quite hazy Temperature: 74F, Dew point: 61F, Wind: S at 6 kts Sea-level pressure: 30.32 inches Hg, falling Visibility: 25 miles, but 20 miles northeast thru southeast BHO SA 1455 23 SCT 25 268/74/61/1806/032/ VSBY NE-SE 20 HAZY ALQDS/ 8/500 55001 1 P.M. Weather: Broken stratocumulus, few moderate cumulus Temperature: 78F, Dew point: 60F, Wind: S at 7 kts Wind: Direction variable east-southeast to south-southwest Sea-level pressure: 30.30 inches Hg, falling Visibility: 20 miles, hazy 6-hourly max. temp: 80F BHO SA 1755 E42 BKN 20 262/78/60/1707/030/ FEW MDT CU HAZY WND 12V22 8/400 58006 10080 20063 WEATHER SUMMARY FOR SUNDAY, MAY 23 TEMPERATURE (DEGREES F) MAX.....73 NORMAL.....69 MIN.....55 NORMAL.....49 MEAN....64 NORMAL.....59 DEPARTURE FROM 30-YEAR AVERAGE................+5 TOTAL DEPARTURE FOR THE MONTH................+75 [+3.2 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............1 DEPARTURE........-6 TOTAL HEATING UNITS FOR THE MONTH...........154 DEPARTURE.......-72 TOTAL HEATING UNITS FOR THE SEASON.........5636 DEPARTURE......-616 TOTAL HEATING UNITS LAST SEASON TO DATE....6060 DIFFERENCE.....-424 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............18 SE AT 8:10 P.M. AEROVANE..............18 SE AT 8:10 P.M. ASOS..................18 SSE AT 8:11 P.M. DAVIS.................19 SE AT 8:11 P.M. THE FASTEST MILE FOR YESTERDAY...........14 SE AT 8:13 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE............14 SE AT 8:51 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........15 SE AT 8:50 P.M. AVERAGE WIND SPEED AND DIRECTION........7.3 SE ASOS.................7.1 DAVIS................7.3 E [100 DEG] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M... 0.00 DEPARTURE......-0.12 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........2.48 DEPARTURE......-0.34 ASOS..............2.46 TOTAL PRECIPITATION FOR THE YEAR..........32.84 DEPARTURE.....+12.07 ASOS.............32.91 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.......0.0 TOTAL SNOWFALL FOR THE MONTH................0.0 DEPARTURE......-0.1 TOTAL SNOWFALL FOR THE SEASON..............64.4 DEPARTURE......+4.3 PRELIMINARY CLIMATE SUMMARY FOR MAY 2010 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane wind recording system gust when significant TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 5/1 81/58/70/+18/0.00/0/684/81 29 SE 5/2 87/56/72/+20/0.00/0/432/51 29 SSW 5/3 80/62/71/+18/0.04/0/170/20 41 W AERO 50 MPH W 5/4 81/52/67/+14/0.09/0/562/66 51 WNW AERO 58 MPH WNW TSTM 5/5 78/50/64/+11/0.00/0/845/99 28 S 5/6 76/54/65/+11/T/0/531/62 46 WNW AERO 48 MPH WNW 5/7 72/47/60/+6/0.00/0/798/93 28 W 5/8 63/45/54/0/0.63/0/034/04 39 WSW AERO 39 MPH WSW TSTM 5/9 53/37/45/-10/0.00/0/717/83 46 W AERO 50 MPH W 5/10 57/35/46/-9/0.00/0/831/96 31 WNW AERO 35 MPH WNW 5/11 57/34/46/-9/0.00/0/625/72 22 SSE 5/12 50/41/46/-10/T/0/000/00 22 S 5/13 66/40/53/-3/0.00/0/776/89 24 WNW 5/14 71/48/60/+3/0.07/0/280/32 22 SW TSTM 5/15 70/54/62/+5/T/0/832/95 37 WNW AERO 40 MPH WNW 5/16 72/48/60/+3/0.00/0/889/99 30 WNW AERO 35 MPH WNW 5/17 75/51/63/+6/0.00/0/739/84 20 SSE 5/18 63/45/54/-4/1.08/0/009/01 35 NE AERO 37 MPH NE 5/19 52/45/49/-9/0.57/0/000/00 42 NE AERO 45 MPH NE 5/20 80/50/65/+7/0.00/0/753/85 23 WSW 5/21 68/54/61/+2/0.00/0/861/97 24 NE 5/22 76/52/64/+5/0.00/0/481/54 23 SSE 5/23 73/55/64/+5/0.00/0/.../.. 18 SE 5/24 our morning low temp: 58F; our normal low is 50F NEW DAILY RECORDS FOR MAY 2010 5/1 - minimum temp. of 58F equals record high minimum for the date set in 2001 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR MAY 24 HIGH 92F IN 1964 LOW 35F IN 1956 PRECIP 2.13 INS IN 1951 PEAK GUST 54 MPH NNE IN 2005 RECORDS FOR MAY 25 HIGH 91F IN 2007 LOW 37F IN 1967 PRECIP 3.73 INS IN 1967 PEAK GUST 83 MPH NE IN 1967 (RECORD FOR MAY) TODAY'S REPORT PREPARED BY: Robert Skilling/Kristin Stewart